9
English
Installation
Communication sequence
SystemInitialization
࡙ At start-up, all registers havethe value 0.
࡙ Ǯ˵ʪϩ˵ʪϩθɇʀ˝ͱ˙ϩ˵ʪđͱʒɵЇϑϩʪθ˙ɇʀʪͱʒЇʪϑʀͱΧʪϩʪʒࡡɵϩϑߡϩͱߣͱ˙ϩ˵ʪʀͱЇʀɇϩͱϑϩɇϩЇϑθʪ˝ϑϩʪθ࣍θʪ˝ϑϩʪθ
ߢ࣎˙ͱθʪɇʀ˵ʒͱͱθЇϩɇθʪЇΧʒɇϩʪʒϩͱߢࢋ
࡙ Ã˙ɇɵϩϑߡϩͱߣͱ˙θʪ˝ϑϩʪθߢɇθʪߢʪЭʪ˙ͱθͱʪʒͱͱθЇϩࡡϩʪɇϑϩ˵ɇϩϩ˵ʪϩθɇʀ˝ͱ˙ɇʒͱͱθɇʒͱЇϩʒͱͱθЇϩϑ˵ɇϑ
been completed, andthat all indoorand outdoorregistervalues have been updated.
࡙ If bit 0 of the communication status registerforan indoorunit is 0, it means thatthis indoorunit is not connected.
࡙ Afterthe poweris turned on, the BMS periodicallyreadsthe communication status registervalues of indoor units. Then, if
ɇʒͱͱθЇϩиϩ˵ɇɵϩϑߡϩͱߣͱ˙ϩ˵ʪθʪ˝ϑϩʪθϑʪϩϩͱߢϑ˙ͱЇʒࡡʀͱϩθͱɇʒͱϩͱθ˝ɇθʪɇЭɇɇɵʪ˙ͱθϩ˵ʪ˙ͱЇʒʒͱͱθ
unit from that time.
࡙ Ɵ˵ʪ9đƊʀɇͱцʀͱϩθͱϩ˵ʪʒͱͱθЇϩϑиϩ˵ɇɵϩϑߡϩͱߣͱ˙ϩ˵ʪʀͱЇʀɇϩͱϑϩɇϩЇϑθʪ˝ϑϩʪθ˙ͱθϩ˵ʪʒͱͱθЇϩϑʪϩϩͱߢࢋ
Monitorand operateunitsfromtheBMS
࡙ When the BMSwrites avalue tothe holding register, a control command is sent tothe relevant indoorunit.
࡙ The holding registervalue foran indoorunit is not updated until a changed status value is received from that indoorunit.
࡙ Because the usermight be able to operate indoorunits with a remote control, the BMS must reads their status periodically.
࡙ If communication between an indoor/outdoorunit and the Modbus interface module is stopped, the last statusvalue is
retained until communication is resumed.
Modbus
interface module
Communication status
(51 bits 0 to 2): 0 (Not Ready)
Check
communication
status.
Monitoring
&
control
Poweron
Communication status
(51 bits 0 to 2) : 7 (Ready)
Indoorunit
BMS
Poweron
Check communication status (51).
Response: 0 (Not Ready)
Tracking
Response: Status
Change a value.
Response: Status
Check communication status (51).
Response: 7 (Ready)
Check indoorstatus
(input & holding registers).
Response: Status
Change a value inthe holding registers.
Response
Check indoorstatus
(input & holding registers).
Response: Status
